I, too, have been having bluetooth issues with my aluminum keyboard and mighty mouse. It connects, but the keyboard disconnects often, and within a few seconds reconnects. The mouse becomes very choppy. I have found that the turning the mouse off and back on, fixes the issue temporarily, and the keyboard isn't as frustrating as it comes back on its own quickly. It has nothing to do with AirPort, as I have researched this months ago and checked all of these.
I have a Logitech BT Dinovo Edge I occasionally use as well, I thought it was interfering, but it actually seems worse when I disconnect/unpair it.
This seems like maybe its just defective BT radios? Maybe the few of us just got the bad ones... Now we just have to see if replacing them might be the solution... I'll let you know how it goes.